Furnace



W. M. D UNCAN.

FURNACE.

APPLICATION FILED ocT. 20. 1917. RENEWED JUNE 21.1920.

1,365,668. 4 Patented 18, 192.

35 SHEEI I.

J W.M.Duncan W. M. DUNGAN.

FURNACE.

APPLICATION `F|LED OCT. 20, 1917. RENEWED !UNE 21.1920.

1 ,365,668, Patenta& Jan. 18,1921,

W. M. D-UNCAN.

FURNACE.

APPLICATION FILED OCT. 20. 1,917. HENEWED mu: 21, 1920.

1,365,668. Patented Jan. 18, 1921.

3 SHEETS-SHEET 3.

PATENT orF cE.

WILLIAM M. DUNCAN, OF ALTON, ILLINOIS.

FURNACE.

Specification" of Letters Petent.

Patented .nin. s, 1921.

Application filed October 20 1917, Serial No. 1.9?,581. Itenewed June 23., 1920. iliel'tl Ne. 39U,GG`?.

To all whom 'it may concem Be it known that I, Urimee M. DUNcN u citizen of the United States of America, :i resident ot Alton, iithe countyoi? Mulieom State of liinoie, have :invented eertoiii new and useful Improvcnents in' Furnziees, ot which the following' iso tull, cleztr, and. exact description,iretei'ence being had to the :iccompenying drewinge, forming :i part of this speeification.

This inventon rehtee to improvemente in fu'nuces, and more particularly to :i turnzice Wherein the draft ;is created artificiolly by means of e, fon, or the like. The `inziin object is to provide :i simple :ind inexpensive means for ren'ioviug ateher from the draft box, or boxes. Another object ie to provide zi very efiicient drzi'tt produeing op paretus. The new structure ie pai'ti'tli:H'ij' od'ipted for uee With :i truveiiug chatin grate.

In the prei'crred form of the ilWGlitiOll., one or more dri't't boxes ;ire :irranged in :i iiurnnce below the tuel supporting elements of the grate and these draft boxes ere open :it the top :For the dieeherge ot air to the tuel. When the apl llfltufi ie in service,` &shes dropping from the grate iviil tnii` through the openinge in the top ot the d raitt boxes and eceumuiote in seid boxes. The dreit producing devices preferehiv i'ichide draft pipes leading' 'from a :hin or bioiver to the oppoeite ende ot the drntt boxes, and one of these ppe` is provided With noi'- inally closed :leh outlet. Under Oi'Ciillll'jv Operatingconditions, oppoeing :iir currente p'esing ttroin the draft ppes flow into the opposite once oi? the dreit boxes under the grate, the air being diseharged froni the tops of the draft boxes to the tuoi. To rcmove the oehes froni the draft box e, the

' esh outietin one ot the draft pipes ie opened,

and the bhst of air passing froni the other dreit pipe is utilized to force the eshes treni the draft boxes to the nshoutlet, zie wiii b( hereinotter described.

With the torcgoing and other object iii view, the inve tion eomprieee the novei construction, corbination and airrzuigemeit ot parte hereinetter more specificeily described and iilustrited in the eceonpzuying drawings, Wherein is shown the )referred enibodiment of the invention; however, it is to be understood that the invention comprehends changes, varietione and Inodificitions which come within the scopo ot the claime hereunto eppended.

Figur-e I :ii zi, horizontdi section token thi-(mei) the i lil'litcfl, showing the draft boxes; ind the conductoi ut oppoeite ende thereot, the chain {rinte being' oinitted.

Fig Il a vertical section., partiv in elevotioii on e ein-ilier eoaie, showing the endl ehein grat@ 'the draft producini' device, and :in rreh ear in :1, eubwav beioiv the grate. i 'I Fig. III :ie :i vertical eectioii. token ripproxiineteiv on the iine III- UL Fita'. H.

To ilhietr ite the inventioii, I hrve saihown e fornoce provided with en emiieee ehain grate .rit irrenged between side tirones '1. nud fitted to Wheeh; 2 and :i ;it oppoeite ende oi the grate. The ivheeie ?E ere eecured to ti eh i tt *Li-,.".V1li(il n't v be :ictuoted in :tnv euii bie ininner to 'teed the ehziin Drn'tt iJDi-i eurrounded by the ehein grate IL ure open iii] the top shown in Fig. II. tor the diecharge ot :iii: to the tuoi. These draft boxes flCi'O ;irrziiiged traineverseiv of the grate :nad Secured to the :aide renies l. Dompere [i TH) erringred in the draft boxes, may be u d in :Lny euit- :iblc nmuner to regiihite the tioiv ot :iii: troin the dreit boxee to the grate. The draft :it

the dit'erent zones above the dreit boxes con be i'r ti'itiii by &tij ietingg; the dumpere (3.

The d tri: produciiig' ineine pr'etereblv Ci'illi'lit'l ;i ten or biovmr U. provided With ;i dieehm'rre ineinbe' end` E.) :i'or eondue eidee o'l the grate *a ineture, lt] deemhiitee reniovobie nip eonnectingr the bronrh conductore` 8 :und 9 to the opposiite ende ot the drzictt borici; The side :ti-miree L which support the ehoiii grate e; draft home., ere mouiited on v 'heeie 'ti (hier. H) eo ti t "i" having brenchee 8 the mr to oppoeite the grate structure con be reuiiiy movedidhe nipph'e *ide turmes 1: "v :removed 'the 'ii`- into and out ot the turnzwc. 10 (I `ig. I) ;rre .bitt end these iiippies :to be froni'the side frames-be grate etrueture treni the Te tete the ieino'vni ot the nippiee i., openin .i 12 m'e tormed in the eoiiduetors R end 9. said openi being` norinz'di v closed to prevent the eecztpe ot the air under preesure Under normal opereting eoiniitione the :Lir passing *lironi 'the :hm .i ie diebarsed :into the conductom or drett pipes 8 end 9, and thereby conducted 'to the nipphe tt) ot the oppoeite ende ot the drittbor The opposing eiii" currents flow in the directions indiceted by the errovie shown iri teh iiiiee in Fig. I. A very effective draft is thus created, the pressure being substantially uniform throughout the draft boxes. The dampers 6 can be regulated to vary the draft at different zones transversely of the grate structure. The draft in a given zone above a draft box is substantially uniform throughout the zone, for the air currents are forced into opposite ends of the draft box, and a very effective draft is thus created in the draft box and at all points above the draft box.

The pipe or conductor 8 is provided with an ash outlet 13, normally closed by a door 14:. An ash chute 15 leads from the outlet 13 to a point above a receptacle 16 in the subway under the furnace. This receptacle 16 is preferably in the form of a car, as illustrated diagrammatieally in Fig. H. 17 designates a valve which normally occupies the open position shown in Fig. III, permitting the air Currents to pass from the fan to both of the conduetors 8 and 9.

Since the draft boxes 5 are open at the top, ashes dropping from the traveling grate will fall into said draft boxes and accumulate therein. Heretofore considerable difficulty has been experienced in removing ashes from draft boxes of this kind. My object is to provide an extremely simple and inexpensive means for removing the ashes.

In accordance with the preferred form of the invention, the ashes can be quickly removed from the draft boxes by merely closing the dampers 6 (Fig. H), moving the door 13 to the position shown by dotted lines in F ig. II, thus opening the ash outlet 13. The valve 17 is preferably moved to the position shown by dotted lines in Fig. III. When the parts are adjusted in this manner, the blast of air passing from the fan or blo'wer B flows through the conduetor 9, thence through the draft boxes 5 as indicated by dotted arrows in Fig. I thereby forcing the ashes from the draft boxes, through the conductor 8, to the ash outlet 13 at the ash chute 15.

When the door 13 occupies the position shown by dotted lines in Fig. II, it eloses direct communication between the fan and the upper portion of the conduetor 8, and this upper portion of the conductor serves as means for conducting ashes from the draft boxes under the grate. The valve 17 (Fg. III) also serves as a closure for preventing direct communication between the fan and the eonductor 8.

The door 14 at the ash outlet 13 is fixed to a shaft 20 provided with a sprocket wheel 21 (Fig. III). A sprocket chain 22 is fitted to the wheel 21 and also to a wheel 23 having an Operating handle 24: which may be actuated to open and close the door 14:.

I claim:

1. A furnace provided with a grate, a

draft box under the fuel supporting ele ments of said grate, said draft box having an opening for the diseharge of air to the grate, a damper for regulating the flow of air from the draft box to the grate, a blst producing device, conduetors leading froni said blast producing device to said draft box so as to direct air under pressure from the blast producing device to the interior of said draft box, one of said eonductors being provided with an ash outlet for the discharge of ashes from said draft box, and a closure normally elosing,` said ash outlet, said dampers and closure being adjustable to provide for the flow of air from one of said conductors, through the draft box and thenee to the ash outlet in the other conductor, thereby forcing ashes from the draft box to said ash outlet.

2. A furnace provided with a grate, a draft box under the fuel supporti'g elements of said grate, said draft box havin;` an opening for the discharge of air to the grate, a damper for regulating the flow of air from the draft box to the grate, a blast produeing device, conductors leading; from said blast producing device to said draft box so as to direct air under pressure from the blast produeing device to the interier of said draft box, one of said eondnctors .r

being provided with an ash outlet for th(` discharge of ashes from said draft box, a closure normally closing' said ash outlet, and a normally open valve adapted to place the last mentioned eonductor out of direct communication with said blast produeing device, said dampers, closure and valve being` adjustable to provide for the flow of air from one of said eonductors, through the draft box and thence to the ash outlet in the other conduetor, thereby forcing ashes from the draft box to said ash outlet.

3. A furnace provided with a grate, a draft box under the fuel supporting elements of said grate, said draft box having an opening for the diseharge of air to the grate, a blast producing device, conduetors leading from said blast produeing device to opposite ends of said draft box so as to provide means for discharging air under pressure into said opposite ends, one of said conductors being provided with an ash outlet at a point between said draft box and blast producing device, and a closure normally elosing said ash outlet, said closure being movable to an open position to provide for the discharge of air and ashes froni the draft box in response to the action of said blast producing device.

4:. A furnace provided with an endless chain grate, draft boxes surrounded by said endless chain grate, said draft boxes being arranged transversely of the grate and being open at the top for the diseharge of air to the fuel on the grate, dampers arranged fl (l l l (l in said draft boxes to regulate the discharge of air to the fuel, a blast producing device, conductors leading from said lolast prodncing device to the opposite ends of said draft boxes so as to provide for the discharge of opposing air currents into the opposite ends of the draft boxes, one of said conductors being provided With an ash outlet for the discharge of ashes from the draft boxes, and a closure normally closing said ash outlet, said dumpers and closure being adjnstable to provide for the flow of air froni one of said condnctors, through the draft boxes, and thence to the ash outlet in the other conductor, thereby forcing ashes froni the draft boxes to said ash outlet.

5. A fnrnace provided With an endless grate, a movable frarne supporting said endless chain grate in the furnace, a draft box carried by said movable frame to provide for the delivery of air to the grate, said draft boxhaving an intake formed in one side of said movable frame, a draft producing device comprising a relatively stationary air conductor leading to a point adjacent said intake in the side of said movable frame, and a slidable nipple forming a detachable connection between said stationary air condnctor and said movable frarne, said slidable nipple being telescoped With said stationary air conductor and also with said intake in the side of said movable frame.

G. .A furnace provided With an endless chain grate, a movable frame supporting said endless chain grate, in the furnace, said frane being removable from the furnace, a draft box carried by said movable .fr-ame and arranged transversely of said grate, said draft box being surrounded by said endless grate to provide for the delivery of air to the fuel supporting surface, said draft box having an intake formed in one side of said movable frame, a draft producing device conprising a relatively stationary air conductor leading to a point adjacent said intake in the side of said movable f'ame, and a slidable nipple forming a detachable connection between said stationary air conductor and' said movable frame, said slidable nipple being in the form of a short sleeve telescoped With said stationary air conductor and also With said intake in the side of said movable frame.

7. A furnace provided With an endless chain grate, a novablo frame supporting said endless chain grate, in the furnace, said franie being removable from the furnace, a draft box carried by said movable frame and arranged transversely of said grate, said draft box being surrounded by said endless grate to provide for the delivery of air to the fuel supporting surface, said draft box having an intake forrned in one side of said novable frarne,` a draft prodncing device conprisng a relatively stationary air conductor leading to a point adjacent said intake in the side of said movable frame, and a slidable npple forming a detachable con nection between said stationary air conductor and said movable frame, said slidable nipple being in the form of a short sleeve telescoped With said stationary air conductor and also With said intake in the side of said Inovable frame, said draft box also having an ash outlet formed in the opposite side of said movable frame, a relatively stationary ash receiver located adjacent to the last nentioned side of said movable frame, and a slidable nipple telescoped With said ash receiver and also With said ash ontlet so as to detachably connect said movable frane to said ash receiver.

In testimony that I claim the foregoing I hereunto affixmy signature.

VVILLIAM .M. DUNCAN. 

